diff --git a/.github/workflows/README.md b/.github/workflows/README.md
deleted file mode 100644
index 2781d9cc0e63d6..00000000000000
--- a/.github/workflows/README.md
+++ /dev/null
@@ -1 +0,0 @@
-Github action workflows should be stored in this directrory.
diff --git a/.github/workflows/clang-tests.yml b/.github/workflows/clang-tests.yml
deleted file mode 100644
index d37637e4b92711..00000000000000
--- a/.github/workflows/clang-tests.yml
+++ /dev/null
@@ -1,43 +0,0 @@
-name: Clang Tests
-
-on:
-  push:
-    branches:
-      - 'release/**'
-    paths:
-      - 'clang/**'
-      - 'llvm/**'
-      - '.github/workflows/clang-tests.yml'
-  pull_request:
-    paths:
-      - 'clang/**'
-      - 'llvm/**'
-      - '.github/workflows/clang-tests.yml'
-
-jobs:
-  build_clang:
-    name: clang check-all
-    runs-on: ${{ matrix.os }}
-    strategy:
-      fail-fast: false
-      matrix:
-        os:
-          - ubuntu-latest
-          - windows-latest
-          - macOS-latest
-    steps:
-    - name: Setup Windows
-      if: startsWith(matrix.os, 'windows')
-      uses: llvm/actions/setup-windows@main
-      with:
-        arch: amd64
-    - name: Install Ninja
-      uses: llvm/actions/install-ninja@main
-    - uses: actions/checkout@v1
-      with:
-        fetch-depth: 250
-    - name: Test clang
-      uses: llvm/actions/build-test-llvm-project@main
-      with:
-        cmake_args: -G Ninja  -DLLVM_ENABLE_PROJECTS="clang" -DCMAKE_BUILD_TYPE=Release
-        build_target: check-clang
diff --git a/.github/workflows/libclang-abi-tests.yml b/.github/workflows/libclang-abi-tests.yml
deleted file mode 100644
index c7d1993ba006d6..00000000000000
--- a/.github/workflows/libclang-abi-tests.yml
+++ /dev/null
@@ -1,151 +0,0 @@
-name: libclang ABI Tests
-
-on:
-  push:
-    branches:
-      - 'release/**'
-    paths:
-      - 'clang/**'
-      - '.github/workflows/libclang-abi-tests.yml'
-  pull_request:
-    paths:
-      - 'clang/**'
-      - '.github/workflows/libclang-abi-tests.yml'
-
-jobs:
-  abi-dump-setup:
-    runs-on: ubuntu-latest
-    outputs:
-      BASELINE_REF: ${{ steps.vars.outputs.BASELINE_REF }}
-      ABI_HEADERS: ${{ steps.vars.outputs.ABI_HEADERS }}
-      ABI_LIBS: ${{ steps.vars.outputs.ABI_LIBS }}
-      BASELINE_VERSION_MAJOR: ${{ steps.vars.outputs.BASELINE_VERSION_MAJOR }}
-      BASELINE_VERSION_MINOR: ${{ steps.vars.outputs.BASELINE_VERSION_MINOR }}
-      LLVM_VERSION_MAJOR: ${{ steps.version.outputs.LLVM_VERSION_MAJOR }}
-      LLVM_VERSION_MINOR: ${{ steps.version.outputs.LLVM_VERSION_MINOR }}
-      LLVM_VERSION_PATCH: ${{ steps.version.outputs.LLVM_VERSION_PATCH }}
-    steps:
-      - name: Checkout source
-        uses: actions/checkout@v1
-        with:
-          fetch-depth: 250
-
-      - name: Get LLVM version
-        id: version
-        uses: llvm/actions/get-llvm-version@main
-
-      - name: Setup Variables
-        id: vars
-        run: |
-          minor_version=0
-          remote_repo='https://github.com/llvm/llvm-project'
-          if [ ${{ steps.version.outputs.LLVM_VERSION_MINOR }} -ne 0 -o ${{ steps.version.outputs.LLVM_VERSION_PATCH }} -eq 0 ]; then
-            major_version=$(( ${{ steps.version.outputs.LLVM_VERSION_MAJOR }} - 1))
-            baseline_ref="llvmorg-$major_version.0.0"
-
-            # If there is a minor release, we want to use that as the base line.
-            minor_ref=`git ls-remote --refs -t $remote_repo llvmorg-$major_version.[1-9].[0-9] | tail -n1 | grep -o 'llvmorg-.\+' || true`
-            if [ -n "$minor_ref" ]; then
-               baseline_ref=$minor_ref
-            else
-              # Check if we have a release candidate
-              rc_ref=`git ls-remote --refs -t $remote_repo llvmorg-$major_version.[1-9].[0-9]-rc* | tail -n1 | grep -o 'llvmorg-.\+' || true`
-              if [ -n "$rc_ref" ]; then
-                baseline_ref=$rc_ref
-              fi
-            fi
-            echo ::set-output name=BASELINE_VERSION_MAJOR::$major_version
-            echo ::set-output name=BASELINE_REF::$baseline_ref
-            echo ::set-output name=ABI_HEADERS::clang-c
-            echo ::set-output name=ABI_LIBS::libclang.so
-          else
-            echo ::set-output name=BASELINE_VERSION_MAJOR::${{ steps.version.outputs.LLVM_VERSION_MAJOR }}
-            echo ::set-output name=BASELINE_REF::llvmorg-${{ steps.version.outputs.LLVM_VERSION_MAJOR }}.0.0
-            echo ::set-output name=ABI_HEADERS::.
-            echo ::set-output name=ABI_LIBS::libclang.so libclang-cpp.so
-          fi
-
-
-  abi-dump:
-    needs: abi-dump-setup
-    runs-on: ubuntu-latest
-    strategy:
-      matrix:
-        name:
-          - build-baseline
-          - build-latest
-        include:
-          - name: build-baseline
-            llvm_version_major: ${{ needs.abi-dump-setup.outputs.BASELINE_VERSION_MAJOR }}
-            ref: ${{ needs.abi-dump-setup.outputs.BASELINE_REF }}
-            repo: llvm/llvm-project
-          - name: build-latest
-            llvm_version_major: ${{ needs.abi-dump-setup.outputs.LLVM_VERSION_MAJOR }}
-            ref: ${{ github.sha }}
-            repo: ${{ github.repository }}
-    steps:
-    - name: Install Ninja
-      uses: llvm/actions/install-ninja@main
-    - name: Install abi-compliance-checker
-      run: |
-        sudo apt-get install abi-dumper autoconf pkg-config
-    - name: Install universal-ctags
-      run: |
-        git clone https://github.com/universal-ctags/ctags.git
-        cd ctags
-        ./autogen.sh
-        ./configure
-        sudo make install
-    - name: Download source code
-      uses: llvm/actions/get-llvm-project-src@main
-      with:
-        ref: ${{ matrix.ref }}
-        repo: ${{ matrix.repo }}
-    - name: Configure
-      run: |
-        mkdir install
-        cmake -B build -S llvm -G Ninja -DLLVM_ENABLE_PROJECTS=clang -DCMAKE_BUILD_TYPE=Debug -DLLVM_TARGETS_TO_BUILD="" -DLLVM_BUILD_LLVM_DYLIB=ON -DLLVM_LINK_LLVM_DYLIB=ON -DCMAKE_C_FLAGS_DEBUG="-g1 -Og" -DCMAKE_CXX_FLAGS_DEBUG="-g1 -Og" -DCMAKE_INSTALL_PREFIX=`pwd`/install llvm
-    - name: Build
-      run: ninja -C build/ ${{ needs.abi-dump-setup.outputs.ABI_LIBS }} install-clang-headers
-    - name: Dump ABI
-      run: |
-        parallel abi-dumper -lver ${{ matrix.ref }} -skip-cxx -public-headers ./install/include/${{ needs.abi-dump-setup.outputs.ABI_HEADERS }} -o {}-${{ matrix.ref }}.abi ./build/lib/{} ::: ${{ needs.abi-dump-setup.outputs.ABI_LIBS }}
-        for lib in ${{ needs.abi-dump-setup.outputs.ABI_LIBS }}; do
-          # Remove symbol versioning from dumps, so we can compare across major versions.
-          sed -i 's/LLVM_${{ matrix.llvm_version_major }}/LLVM_NOVERSION/' $lib-${{ matrix.ref }}.abi
-        done
-    - name: Upload ABI file
-      uses: actions/upload-artifact@v2
-      with:
-        name: ${{ matrix.name }}
-        path: "*${{ matrix.ref }}.abi"
-
-  abi-compare:
-    runs-on: ubuntu-latest
-    needs:
-      - abi-dump-setup
-      - abi-dump
-    steps:
-      - name: Download baseline
-        uses: actions/download-artifact@v1
-        with:
-          name: build-baseline
-      - name: Download latest
-        uses: actions/download-artifact@v1
-        with:
-          name: build-latest
-
-      - name: Install abi-compliance-checker
-        run: sudo apt-get install abi-compliance-checker
-      - name: Compare ABI
-        run: |
-          for lib in ${{ needs.abi-dump-setup.outputs.ABI_LIBS }}; do
-            abi-compliance-checker -lib $lib -old build-baseline/$lib*.abi -new build-latest/$lib*.abi
-          done
-      - name: Upload ABI Comparison
-        if: always()
-        uses: actions/upload-artifact@v2
-        with:
-          name: compat-report-${{ github.sha }}
-          path: compat_reports/
-
diff --git a/.github/workflows/libclc-tests.yml b/.github/workflows/libclc-tests.yml
deleted file mode 100644
index 6be01c839f4438..00000000000000
--- a/.github/workflows/libclc-tests.yml
+++ /dev/null
@@ -1,53 +0,0 @@
-name: libclc Tests
-
-on:
-  push:
-    branches:
-      - 'release/**'
-    paths:
-      - 'clang/**'
-      - 'llvm/**'
-      - 'libclc/**'
-      - '.github/workflows/libclc-tests.yml'
-  pull_request:
-    paths:
-      - 'clang/**'
-      - 'llvm/**'
-      - 'libclc/**'
-      - '.github/workflows/libclc-tests.yml'
-
-jobs:
-  build_libclc:
-    name: libclc test
-    runs-on: ${{ matrix.os }}
-    strategy:
-      fail-fast: false
-      matrix:
-        os:
-          - ubuntu-latest
-          # Disable build on windows, because I can't figure out where llvm-config is.
-          #- windows-latest
-          - macOS-latest
-    steps:
-    - name: Setup Windows
-      if: startsWith(matrix.os, 'windows')
-      uses: llvm/actions/setup-windows@main
-      with:
-        arch: amd64
-    - name: Install Ninja
-      uses: llvm/actions/install-ninja@main
-    - uses: actions/checkout@v1
-      with:
-        fetch-depth: 250
-    - name: Build clang
-      uses: llvm/actions/build-test-llvm-project@main
-      with:
-        cmake_args: -G Ninja  -DLLVM_ENABLE_PROJECTS="clang" -DCMAKE_BUILD_TYPE=Release
-        build_target: ""
-    - name: Build and test libclc
-      # spirv targets require llvm-spirv, so skip building them until we figure out
-      # how to install this tool.
-      run: |
-        cmake -G Ninja -S libclc -B libclc-build -DLLVM_CONFIG=`pwd`/build/bin/llvm-config -DLIBCLC_TARGETS_TO_BUILD="amdgcn--;amdgcn--amdhsa;r600--;nvptx--;nvptx64--;nvptx--nvidiacl;nvptx64--nvidiacl"
-        ninja -C libclc-build
-        ninja -C libclc-build test
diff --git a/.github/workflows/lld-tests.yml b/.github/workflows/lld-tests.yml
deleted file mode 100644
index 1e5540d2fc4dee..00000000000000
--- a/.github/workflows/lld-tests.yml
+++ /dev/null
@@ -1,43 +0,0 @@
-name: LLD Tests
-
-on:
-  push:
-    branches:
-      - 'release/**'
-    paths:
-      - 'lld/**'
-      - 'llvm/**'
-      - '.github/workflows/lld-tests.yml'
-  pull_request:
-    paths:
-      - 'lld/**'
-      - 'llvm/**'
-      - '.github/workflows/lld-tests.yml'
-
-jobs:
-  build_lld:
-    name: lld check-all
-    runs-on: ${{ matrix.os }}
-    strategy:
-      fail-fast: false
-      matrix:
-        os:
-          - ubuntu-latest
-          - windows-latest
-          - macOS-latest
-    steps:
-    - name: Setup Windows
-      if: startsWith(matrix.os, 'windows')
-      uses: llvm/actions/setup-windows@main
-      with:
-        arch: amd64
-    - name: Install Ninja
-      uses: llvm/actions/install-ninja@main
-    - uses: actions/checkout@v1
-      with:
-        fetch-depth: 250
-    - name: Test lld
-      uses: llvm/actions/build-test-llvm-project@main
-      with:
-        cmake_args: -G Ninja  -DLLVM_ENABLE_PROJECTS="lld" -DCMAKE_BUILD_TYPE=Release
-        build_target: check-lld
diff --git a/.github/workflows/lldb-tests.yml b/.github/workflows/lldb-tests.yml
deleted file mode 100644
index 1658c0e001a01e..00000000000000
--- a/.github/workflows/lldb-tests.yml
+++ /dev/null
@@ -1,50 +0,0 @@
-name: lldb Tests
-
-on:
-  push:
-    branches:
-      - 'release/**'
-    paths:
-      - 'clang/**'
-      - 'llvm/**'
-      - 'lldb/**'
-      - '.github/workflows/lldb-tests.yml'
-  pull_request:
-    paths:
-      - 'clang/**'
-      - 'llvm/**'
-      - 'lldb/**'
-      - '.github/workflows/lldb-tests.yml'
-
-jobs:
-  build_lldb:
-    name: lldb build
-    runs-on: ${{ matrix.os }}
-    # Workaround for build faliure on Mac OS X: llvm.org/PR46190, https://github.com/actions/virtual-environments/issues/2274
-    env:
-      CPLUS_INCLUDE_PATH: /usr/local/opt/llvm/include/c++/v1:/Library/Developer/CommandLineTools/SDKs/MacOSX10.15.sdk/usr/include
-    strategy:
-      fail-fast: false
-      matrix:
-        os:
-          - ubuntu-latest
-          - windows-latest
-          - macOS-latest
-    steps:
-    - name: Setup Windows
-      if: startsWith(matrix.os, 'windows')
-      uses: llvm/actions/setup-windows@main
-      with:
-        arch: amd64
-    - name: Install Ninja
-      uses: llvm/actions/install-ninja@main
-    - uses: actions/checkout@v1
-      with:
-        fetch-depth: 250
-    - name: Build lldb
-      uses: llvm/actions/build-test-llvm-project@main
-      with:
-        # Mac OS requries that libcxx is enabled for lldb tests, so we need  to disable them.
-        cmake_args: -G Ninja  -DLLVM_ENABLE_PROJECTS="clang;lldb" -DCMAKE_BUILD_TYPE=Release -DLLDB_INCLUDE_TESTS=OFF
-        # check-lldb is not consistent, so we only build lldb.
-        build_target: ""
diff --git a/.github/workflows/llvm-tests.yml b/.github/workflows/llvm-tests.yml
deleted file mode 100644
index bb011c0dafbb29..00000000000000
--- a/.github/workflows/llvm-tests.yml
+++ /dev/null
@@ -1,178 +0,0 @@
-name: LLVM Tests
-
-on:
-  push:
-    branches:
-      - 'release/**'
-    paths:
-      - 'llvm/**'
-      - '.github/workflows/llvm-tests.yml'
-  pull_request:
-    paths:
-      - 'llvm/**'
-      - '.github/workflows/llvm-tests.yml'
-
-jobs:
-  build_llvm:
-    name: llvm check-all
-    runs-on: ${{ matrix.os }}
-    strategy:
-      fail-fast: false
-      matrix:
-        os:
-          - ubuntu-latest
-          - windows-latest
-          - macOS-latest
-    steps:
-    - name: Setup Windows
-      if: startsWith(matrix.os, 'windows')
-      uses: llvm/actions/setup-windows@main
-      with:
-        arch: amd64
-    - name: Install Ninja
-      uses: llvm/actions/install-ninja@main
-    - uses: actions/checkout@v1
-      with:
-        fetch-depth: 250
-    - name: Test llvm
-      uses: llvm/actions/build-test-llvm-project@main
-      with:
-        cmake_args: -G Ninja -DCMAKE_BUILD_TYPE=Release
-
-  abi-dump-setup:
-    runs-on: ubuntu-latest
-    outputs:
-      BASELINE_REF: ${{ steps.vars.outputs.BASELINE_REF }}
-      ABI_HEADERS: ${{ steps.vars.outputs.ABI_HEADERS }}
-      BASELINE_VERSION_MAJOR: ${{ steps.vars.outputs.BASELINE_VERSION_MAJOR }}
-      LLVM_VERSION_MAJOR: ${{ steps.version.outputs.LLVM_VERSION_MAJOR }}
-      LLVM_VERSION_MINOR: ${{ steps.version.outputs.LLVM_VERSION_MINOR }}
-      LLVM_VERSION_PATCH: ${{ steps.version.outputs.LLVM_VERSION_PATCH }}
-    steps:
-      - name: Checkout source
-        uses: actions/checkout@v1
-        with:
-          fetch-depth: 250
-
-      - name: Get LLVM version
-        id: version
-        uses: llvm/actions/get-llvm-version@main
-
-      - name: Setup Variables
-        id: vars
-        run: |
-          if [ ${{ steps.version.outputs.LLVM_VERSION_MINOR }} -ne 0 -o ${{ steps.version.outputs.LLVM_VERSION_PATCH }} -eq 0 ]; then
-            echo ::set-output name=BASELINE_VERSION_MAJOR::$(( ${{ steps.version.outputs.LLVM_VERSION_MAJOR }} - 1))
-            echo ::set-output name=ABI_HEADERS::llvm-c
-          else
-            echo ::set-output name=BASELINE_VERSION_MAJOR::${{ steps.version.outputs.LLVM_VERSION_MAJOR }}
-            echo ::set-output name=ABI_HEADERS::.
-          fi
-
-  abi-dump:
-    needs: abi-dump-setup
-    runs-on: ubuntu-latest
-    strategy:
-      matrix:
-        name:
-          - build-baseline
-          - build-latest
-        include:
-          - name: build-baseline
-            llvm_version_major: ${{ needs.abi-dump-setup.outputs.BASELINE_VERSION_MAJOR }}
-            ref: llvmorg-${{ needs.abi-dump-setup.outputs.BASELINE_VERSION_MAJOR }}.0.0
-            repo: llvm/llvm-project
-          - name: build-latest
-            llvm_version_major: ${{ needs.abi-dump-setup.outputs.LLVM_VERSION_MAJOR }}
-            ref: ${{ github.sha }}
-            repo: ${{ github.repository }}
-    steps:
-    - name: Install Ninja
-      uses: llvm/actions/install-ninja@main
-    - name: Install abi-compliance-checker
-      run: |
-        sudo apt-get install abi-dumper autoconf pkg-config
-    - name: Install universal-ctags
-      run: |
-        git clone https://github.com/universal-ctags/ctags.git
-        cd ctags
-        ./autogen.sh
-        ./configure
-        sudo make install
-    - name: Download source code
-      uses: llvm/actions/get-llvm-project-src@main
-      with:
-        ref: ${{ matrix.ref }}
-        repo: ${{ matrix.repo }}
-    - name: Configure
-      run: |
-        mkdir install
-        cmake -B build -G Ninja -DCMAKE_BUILD_TYPE=Debug -DLLVM_TARGETS_TO_BUILD="" -DLLVM_BUILD_LLVM_DYLIB=ON -DCMAKE_C_FLAGS_DEBUG="-g1 -Og" -DCMAKE_CXX_FLAGS_DEBUG="-g1 -Og" -DCMAKE_INSTALL_PREFIX=`pwd`/install llvm
-    - name: Build
-      # Need to run install-LLVM twice to ensure the symlink is installed (this is a bug).
-      run: |
-        ninja -C build install-LLVM
-        ninja -C build install-LLVM
-        ninja -C build install-llvm-headers
-    - name: Dump ABI
-      run: |
-        if [ "${{ needs.abi-dump-setup.outputs.ABI_HEADERS }}" = "llvm-c" ]; then
-          nm ./install/lib/libLLVM.so | awk "/T _LLVM/ || /T LLVM/ { print $3 }" | sort -u | sed -e "s/^_//g" | cut -d ' ' -f 3 > llvm.symbols
-          # Even though the -symbols-list option doesn't seem to filter out the symbols, I believe it speeds up processing, so I'm leaving it in.
-          export EXTRA_ARGS="-symbols-list llvm.symbols"
-        else
-          touch llvm.symbols
-        fi
-        abi-dumper $EXTRA_ARGS -lver ${{ matrix.ref }} -skip-cxx -public-headers ./install/include/${{ needs.abi-dump-setup.outputs.ABI_HEADERS }} -o ${{ matrix.ref }}.abi ./install/lib/libLLVM.so
-        # Remove symbol versioning from dumps, so we can compare across major versions.
-        sed -i 's/LLVM_${{ matrix.llvm_version_major }}/LLVM_NOVERSION/' ${{ matrix.ref }}.abi
-    - name: Upload ABI file
-      uses: actions/upload-artifact@v1
-      with:
-        name: ${{ matrix.name }}
-        path: ${{ matrix.ref }}.abi
-
-    - name: Upload symbol list file
-      if: matrix.name == 'build-baseline'
-      uses: actions/upload-artifact@v1
-      with:
-        name: symbol-list
-        path: llvm.symbols
-
-  abi-compare:
-    runs-on: ubuntu-latest
-    needs:
-      - abi-dump-setup
-      - abi-dump
-    steps:
-      - name: Download baseline
-        uses: actions/download-artifact@v1
-        with:
-          name: build-baseline
-      - name: Download latest
-        uses: actions/download-artifact@v1
-        with:
-          name: build-latest
-      - name: Download symbol list
-        uses: actions/download-artifact@v1
-        with:
-          name: symbol-list
-
-      - name: Install abi-compliance-checker
-        run: sudo apt-get install abi-compliance-checker
-      - name: Compare ABI
-        run: |
-          if [ -s symbol-list/llvm.symbols ]; then
-            # This option doesn't seem to work with the ABI dumper, so passing it here.
-            export EXTRA_ARGS="-symbols-list symbol-list/llvm.symbols"
-          fi
-          # FIXME: Reading of gzip'd abi files on the GitHub runners stop
-          # working some time in March of 2021, likely due to a change in the
-          # runner's environment.
-          abi-compliance-checker $EXTRA_ARGS -l libLLVM.so -old build-baseline/*.abi -new build-latest/*.abi || test "${{ needs.abi-dump-setup.outputs.ABI_HEADERS }}" = "llvm-c"
-      - name: Upload ABI Comparison
-        if: always()
-        uses: actions/upload-artifact@v1
-        with:
-          name: compat-report-${{ github.sha }}
-          path: compat_reports/